Anti-Stokes Raman spectra of single-walled carbon nanotubes

Brown, S. R.; Cório, Paola; Marucci, A.; Dresselhaus, M. S.; Pimenta, M. A.; Kneipp, Katrin

doi:10.1103/physrevb.61.r5137

Cited by 140 publications

(122 citation statements)

References 6 publications

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“…As such, the broad G − peak was used as an indicator of the presence of metallic nanotubes for many years until further refinements were made (see Section VII). In another work by Brown et al, 82 it was shown that anti-Stokes and Stokes Raman spectra taken at the same excitation wavelengths demonstrated very different line shapes in their respective G-bands, one corresponding to metallic species and the other to semiconducting species.…”

Section: B Resonant Raman Scatteringmentioning

confidence: 99%

Fundamental optical processes in armchair carbon nanotubes

Hároz

Duque

et al. 2013

Nanoscale

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Single-wall carbon nanotubes provide ideal model 1-D condensed matter systems in which to address fundamental questions in many-body physics, while, at the same time, they are leading candidates for building blocks in nanoscale optoelectronic circuits. Much attention has been recently paid to their optical properties, arising from 1-D excitons and phonons, which have been revealed via photoluminescence, Raman scattering, and ultrafast optical spectroscopy of semiconducting carbon nanotubes. On the contrary, dynamical properties of metallic nanotubes have been poorly explored, although they are expected to provide a novel setting for the study of electron-hole pairs in the presence of degenerate 1-D electrons. In particular, (n,n)-chirality, or armchair, metallic nanotubes are truly gapless with massless carriers, ideally suited for dynamical studies of Tomonaga-Luttinger liquids. Unfortunately, progress towards such studies has been slowed by the inherent problem of nanotube synthesis whereby both semiconducting and metallic nanotubes are produced. Here, we use post-synthesis separation methods based on density gradient ultracentrifugation and DNAbased ion-exchange chromatography to produce aqueous suspensions strongly enriched in armchair nanotubes. Through resonant Raman spectroscopy of the radial breathing mode phonons, we provide macroscopic and unambiguous evidence that density gradient ultracentrifugation can enrich armchair nanotubes. Furthermore, using conventional, optical absorption spectroscopy in the nearinfrared and visible range, we show that interband absorption in armchair nanotubes is strongly excitonic. Lastly, by examining the G-band mode in Raman spectra, we determine that observation of the broad, lower frequency (G − ) feature is a result of resonance with non-armchair "metallic" nanotubes. These findings regarding the fundamental optical absorption and scattering processes in metallic carbon nanotubes lay the foundation for further spectroscopic studies to probe many-body physical phenomena in one dimension.

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Section: B Resonant Raman Scatteringmentioning

confidence: 99%

Fundamental optical processes in armchair carbon nanotubes

Hároz

Duque

et al. 2013

Nanoscale

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“…Raman spectroscopy is a popular, non-destructive tool for structural characterisation of carbons [3][4][5][6][7][8][9][10][11][12]. It is traditionally carried out at the commonly available wavelengths in the blue-green spectral region (488-514.5 nm), but multi-wavelength Raman (MW Raman) studies are becoming increasingly used.…”

Section: Introductionmentioning

confidence: 99%

A Model to Interpret the Raman Spectra of Disordered, Amorphous and Nanostructured Carbons

Ferrari

2001

MRS Proc.

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Raman spectroscopy is a very popular, non-destructive tool for the structural characterisation of carbons. Raman scattering from carbons is always a resonant process, in which those configurations whose band gaps match the excitation energy are preferentially excited. The Raman spectra of carbons do not follow the vibration densitý• of states, but consist of three basic features, the G and D peaks around 1600 and 1350 cm-and an extra T peak, for UV excitation, at -980-1060 cm . The Raman spectra at any wavelength depend on 1) clustering of the sp 2 phase, 22 bond length and bond angle disorder, 3) presence of sp 2 rings or chains, and 4) the sp 2 /sp ratio. It will be shown how the basic features of the Raman spectra vary by rationalising them within a three-stage model of order of carbons. It is shown how the three-stage model can account for the vast range of experimental data available for Raman experiments at any excitation wavelength. This model can also account for apparently contradictory trends reported in literature, since the clustering of the sp 2 phase and the sp 3 to sp 2 conversion are separately treated.

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“…1 b), the observed lineshapes in the Stokes and Anti-Stokes spectra are markedly different. Such differences have been reported earlier in AD-SWNTs for incident laser energies ≤1.92 eV [9]. These studies have shown that significant additional Raman scattering intensity in the region of 1500-1550 cm -1…”

mentioning

confidence: 70%

Radial and tangential vibrational modes of HiPCO‐derived carbon nanotubes under pressure

Venkateswaran

Gosselin

Postek

et al. 2003

Physica Status Solidi (b)

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We investigate the differences in the pressure dependence of the Raman-active phonons in carbon nanotubes of different diameter and conducting nature. The pressure dependence of the tangential bands of the metallic tubes is found to be about the same as that of the semiconducting tubes. However, for the radial bands, the larger diameter semiconducting tubes are seen to exhibit a larger pressure coefficient than smaller diameter metallic tubes. We assign this behavior to the diameter dependence and not the conductivity of the tubes. We find a strong inverse diameter dependence for the normalized pressure derivative of the radial band frequency (ω R ) in contrast to the recent predictions for isolated tubes. This suggests that faceting of the tubes in the bundles may be the dominant contribution to the pressure dependence of ω R .

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Anti-Stokes Raman spectra of single-walled carbon nanotubes

Cited by 140 publications

References 6 publications

Fundamental optical processes in armchair carbon nanotubes

Fundamental optical processes in armchair carbon nanotubes

A Model to Interpret the Raman Spectra of Disordered, Amorphous and Nanostructured Carbons

Radial and tangential vibrational modes of HiPCO‐derived carbon nanotubes under pressure

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